Philips 20PFL4122/93 Service Manual page 14

14 TPS 1.0A LA
5. Service Modes, Error Codes and Fault Finding
3.No picture/LED is green
Check
scaler board U102
pin1=14V,pin4=1.22V,
pin7=16V,pin8
=5V
Yes
Check if
working voltage
U152,pin2=3.3V
pin3=5V
Yes
Check if clock
source X350
Yes
Check if
RGB,clk,H/V and
DE signal output 128
bits TTL
Yes
Check
resistors-network
Yes
Replace LVDS cable
No
Check power
Check circuit around
No
each regulator and
eliminate short and
open situation
No
Replace X350
Try to replace
No
flash Rom
EEPROM
No
Replace bad resistors-
network